JPS6020091A - Latent heat storaging device - Google Patents

Abstract

PURPOSE:To obtain the stable heat-exchange output at high temperature by a structure wherein latent heat storaging material, heat transfer medium, which is incompatible with said latent heat storaging material and has higher density, and high density liquid, which is compatible with said heat transfer medium and has specific weight larger than that of said heat transfer medium, are sealed in a heat storage tank. CONSTITUTION:Latent heat storaging material 3 such as triaquo-sodium acetate, heat transfer medium 4, which is incompatible with the latent heat storaging material 3 and has higher density, such as flon F-113, and high density liquid, which is compatible with the heat transfer medium 4 and has specific weight larger than that of the heat transfer medium 4 and at the same time is incompatible with the latent heat storaging material 3, such as carbon tetrafluoride are sealed in a heat storage tank 1. Due to the structure as mentioned above, the temperature drops at the upper portion in the part filled with the latent heat storaging material 3 and of the steam in a space can be prevented from developing. Consequently, the stable heat-exchange output can be obtained at high temperature.

Description

[Detailed description of the invention] Industrial application field 1) Storing late night electricity and solar energy efficiency 6)
・It relates to a latent heat storage device that uses a latent heat storage device for heating and cooling.

Conventional example of Ikobo and its problems FIG. 1 shows a conventional heat storage device 1. As shown in FIG.

Heat storage device 1 Heat storage tank 2 contains a heat storage material 3 that changes from liquid to gas when heat is absorbed and from gas to liquid when heat is released, and the density of the condensed liquid is at least close to the phase transition point of the heat storage material. It is constructed by enclosing a heat transfer medium 4 which is larger than non-density, leaving a space above, and housing a heat exchanger 5 for storing heat and a heat exchanger 6 for extracting heat.

In the heat storage state, the heat storage material filling part is made of a heat storage phase solution having a temperature of 2.5 degrees higher than the melting point of the heat storage material 3, and the space is 1 degree lower than the saturated vapor pressure of the heat transfer medium at that temperature. heat exchanger 6
When a low-temperature heat medium is introduced into the space, the heat transfer medium in the space exchanges heat in the heat exchanger 6 and is condensed and liquefied, so that the vapor pressure in the space decreases. In order to compensate for this, the heat transfer medium evaporates from the heat storage material filled portion, becomes bubbles 7, rises, and reaches the space. On the other hand, the U-condensed liquid 8 drips and flows back into the heat storage and absorption section. The condensed liquid 8 dropped into the heat storage material filling part has a higher density than the heat storage material, so it descends in the heat storage material solution. Instead of falling, most of the heat absorbs heat from the heat storage material 3, evaporates, and rises in the form of bubbles. The other part settles to the bottom of the heat storage tank 2, where it gains heat and evaporates again. However, as you can see from the Dfj notes, the evaporation of the condensate occurs mainly in the upper part of the heat storage material filling part, so the second part is vigorously stirred, but the further you go to the bottom, the more gentle the stirring becomes. . In addition, when heat is applied to the condensed liquid, the solution is stirred by air bubbles, so the microcrystals are floating, but since the density is higher than in the liquid state, they gradually settle. In this way, the evaporation of the heat transfer medium 4 -
The heat storage material filled portion is agitated by the pre-condensation cycle, and heat is efficiently exchanged in the heat exchanger 6. However, the temperature of the heat storage material decreases. This is made up of a relatively low-temperature supply liquid dripping at the top, a relatively low-temperature heat storage material that has lost its heat to the condensed liquid, and has become microcrystals, and a heat storage 4A solution. This is because the temperature becomes lower. As the upper temperature decreases, the vapor equilibrium 7fflR in the space decreases. Therefore, since the heat exchange temperature in the heat exchanger 6 decreases, the temperature increase value of the low-temperature heat medium decreases. As can be seen from the above explanation, in conventional heat exchange, the temperature of the space decreases over time, and the heat exchange efficiency decreases, so the introduced low-temperature heat medium cannot be extracted as a high-temperature heat medium at a constant temperature. Ta.

The purpose of the present invention is to solve the above-mentioned problems, prevent the deterioration of the heat exchange performance of the radiator due to the drop in the upper temperature of the heat storage material, and obtain a stable heat exchange output at high temperatures. shall be.

Structure of the Invention □ In order to achieve the 110th object, the present invention provides (1) a latent heat storage material, and (2) a latent heat storage material that is almost incompatible with the latent heat storage material, and that changes from a liquid to a gas when absorbing heat, and from a gas when releasing heat. A heat transfer medium that becomes a liquid and a high-density liquid that is incompatible with the latent heat storage material described in the previous paragraph, is compatible with the heat transfer medium, and has a higher specific gravity than the heat transfer medium are placed inside a heat storage tank with a space left above. It is enclosed in one piece.

Due to the structure, the heat storage material filling part that occurs when heat is taken out.
It is possible to prevent a temperature drop in the second part and in the space steam, and obtain stable heat exchange output at high temperatures.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 2. Items in Figure 2 that are the same as those in Figure 1 are given the same numbers.

In FIG. 2, the heat storage device 1 is provided with a heat insulating tank 6.
It has a structure including a heat storage tank 2 and a heat exchanger 5.6. In the heat storage tank 2, sodium acetate trihydrate (melting point 58°C,
Density of the melt near the melting point 1,28 g/cnl)
A heat storage material 3 such as
．． A heat transfer medium that is incompatible with the heat storage material and has a high density such as
compatibility with a heat transfer medium such as 5g/cffl),
A high-density liquid that has a higher specific gravity than the heat transfer medium and is incompatible with heat storage 4) J is enclosed. The high-density liquid dissolves in the heat transfer medium 4, and the ratio of the dissolved liquid is large.
Accumulates at the bottom of heat storage tank 2.

When the heat storage device 1 is in the heat storage state, the heat exchanger 6 is
When $1 of heat medium flows in, the heat storage material filling part is stirred by the evaporation-condensation cycle of the heat transfer medium 4 as explained in FIG. 1, and the heat transfer medium undergoes heat exchange in the heat exchanger 6. and dissipate heat. At this time, as explained above, the temperature of the upper part of the heat storage material filling section is lowered. In this embodiment, the high-density liquid is dissolved in the condensed liquid, and the apparent density of the condensed liquid increases and quickly settles in the heat storage material, thereby preventing a drop in temperature at the upper part of the heat storage material.

That is, the heat output current value heat medium 4 becomes bubbles 7, rises, and evaporates into the space. At this time, the high-density liquid also rises in the heat storage material along with the heat transfer medium, but the high-density liquid does not evaporate and is left behind at the top of the heat storage material. Since the heat storage material is vigorously stirred for the reason mentioned above, the high-density liquid left behind exists as a fine dispersion 10 in the upper part of the heat storage tank. The evaporated heat transfer medium exchanges heat with the heat exchanger 6 and returns to the heat storage material 3 as a condensate 8. At this time, the high-density liquid dispersion 10 dissolves in the condensate 8 and forms a mixed solution 9 in the upper part of the heat storage material. Since this mixed solution has a density higher than that of the heat transfer medium, it immediately settles in the heat storage material.

As it sinks, it absorbs heat and the heat transfer medium evaporates again. Since the mixed solution 9 has a higher density than the heat transfer medium, it stays in the upper part of the heat storage material for a short time. That is, the amount of heat acquired from the upper part of the heat storage material is smaller. Moreover, since the mixed solution 9 has a high density, it can sufficiently settle to the lower part of the heat storage tank, and the heat from the lower part can also be taken out.

1] In Note 11 l:llj, we explained the case where the density of the heat transfer medium is higher than the density of the heat storage material. ．． A similar effect can be obtained.

In the above explanation, either the high-density liquid is completely compatible with the heat transfer medium, or even if it is incompatible, it can be made compatible with the heat transfer medium through the intervention of a third substance. A similar effect can be obtained.

Zu reward! Effect of L'J According to the present invention, high-density liquid dissolves in the condensed and liquefied heat transfer medium, increasing the apparent specific gravity. The time is short.

(b) Since the condensate becomes sharp when it settles to the -F part, the entire heat storage tank is well stirred.

For the above reason, the temperature of the upper part of the heat storage material does not decrease, so the temperature of the heat transfer medium vapor does not decrease and is maintained at a high temperature. Therefore, it is possible to prevent the heat exchange performance of the radiator from deteriorating and to obtain stable heat exchange output at high temperatures.

Also, is the mixed solution of heat transfer medium and high-density liquid located at the bottom of the heat storage tank because it has a higher density than the heat storage material? ! : Stay within.

If a heating (heat storage) heat exchanger 5 is provided in or near this mixed solution, heat will be diffused by B1 distillation of the liquid during heating, so that efficient heating can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional latent heat storage device, and FIG. 2 is a sectional view of a latent heat storage device showing an embodiment of the present invention. ↓・Latent heat storage device, 2・Heat storage tank, 3−・Heat storage material, 4・・・・Heat transfer medium

Claims (1)

[Claims] It is almost incompatible with the latent heat storage material and the latent heat storage 4:A', and when heat is absorbed, the liquid changes into a gas, and the heat is released 1.
A space is formed above the inside of the heat transfer medium, which changes from a gas to a liquid, and a liquid that is incompatible with the iM heat storage medium, is compatible with the heat transfer medium, and has a higher density than the heat transfer medium. The latent heat storage device is sealed inside the heat storage tank.